Triphenylmethane dye.



.W I STATES;

ARTH R nao snonrnmor ELBERFELIQ), m cam. nmnnnnmon, or LEVEBKUSEN near. COLOGNE, GERMANY, assrenons T -'IE ARBENFABRIKEN vonm. rmmm; AY aco pr .nLBnnrn n, GERMANY, A CQRPORATIQN on. GERMANY.

No Drawing.

V mm m xm nYnl To all whom it may concern:

Be it known that we, ARTHUR HAUsot'mFER and CARL. HEIDENREICH, doctors of philosophy, chemists, citizens of the German Empire, residing, respectively, at Elberfeld and Leverkusen, near Cologne, Germany,'have invented new and useful Improvements in New Triphenylmethane Dye, of which the following is a specification.

Ithas been found that new and valuable triphenylmethane dyestuffs capable of being chromed after dyeing are obtained by treating the leuco compounds of the triphenylmethane series, (obtained by condensing aminobenzaldehydes which may contain substituents in the benzene nucleus with 2 molecules of an aromatic oxycarboxylic acid) with chlorodinitrobenzene compounds, especially 1.3-dichloro-.S-dinitrobenzene, 1- chlor'o-2A-dinitrobenzene, 1-chloro-2.6-dinitrobenzenel-sulfonic acid, 1-chloro-4.6-dinitrobenzene-2-sulfon ic acid and by convertingthe resulting leuco compounds into the dyestuffs by oxidation.

Thenew dyestuifs are after being dried and pulverized from red to red-brown pow They dye wool from acid bath yellow to yellow-red shades, which turn green to black 1 J I Specification of Letters Patent; Patented J 111V 25, 1911. Application filed January 16, 1911. Serial 1Y0.. 602',986. I

on chroming. The chromedshades are 'fast to potting and to light.

In order to illust-rate the new process more fully the following examples aregiven, the parts beingby weight:

pound obtained from ortho-chloro-meta-;

ortho-cresotinic acid are dissolved; in 400 parts of water and 33 parts oficalcinated' Example 1: 90 parts ofthe leuco com-j} aminobenzaldehyde. and 2' molecules 01',-.

sodium carbonate and are boiledr withl 44;

parts of chlorodinitrobenzene for: 8 .to

hours in a vessel provided with a reflux condenser. vThe sodium salt 'of the condensa- I tion product thus obtainedcrys'tallizes from? the cooling solution. It is filtered oif and dried. Recrystallized from hot/"water the 1 sodium salt is obtained inmthe shape of." v

golden yellow leaflets; TthCOIlYItdt, into 7 the dyestutf 66 parts of the dried sodium salt are dissolved in,350 parts of concen acid is added. The mixture is heated while it is stirred to 50 C. until;;,t-he quantity of the dyestufi thus produced does no longer increase. The sulfuric acid solution isin -j,

troduced into ice, the precipitate is filtered oil, washed with water and dried. The dyestufi which is produced according to the fol: lowing equation:

centrated sulfuric acid with a red color. It

dyes wool from acid bath an intense yellow,

which turns blue-greenish on chroming.

Example 2: parts of the leuco com noon 0 pound obtained from ortho-chloro-paraaininobenzaldehyde and 2 molecules of oi'tlio-cresotinic acid are dissolved in water and sodium carbonate according to Example 1 and boiledwith ll parts of chloro-dinitrobenzene in a vessel provided with a reflux condenser. Sulfuric acid is added to the cooled solution and the separated leuco' compound is then filtered 01f, washed with water, dried and ground. It has a deep yellow color and is soluble with the same color in dilute alkalis. The oxidation of the condensation product is performed as in Example 1.. The dyestutl is obtained as a dark brown powder, which is dif'ficultly soluble in water and soluble in a weak soda lye giying a brown-yellow color. The brown-yellow dyeing obtained in acid bath when treated with chronic passes to a full green.

\Yhen other leuco compounds instead of those described in Examples 1 and 2 are used as for instance those from meta-aminobenzaldeliydeort ho-sulfonic acid and 2 molecules ortho-cresotinic acid a dyestutf is obtained which is easily soluble inhot water. Itdyes wool in acid baths orange which turns green on chrqniing. The ortho-cresotinic acid used in the above mentioned examples can be replaced totally or partially by other aromatic oxy-carboxylic acids, such as salicylic acid and their deriva- 'tives, alpha-oxy-naphthoic acid, etc.

We claim l. The herein described new inordant dyestuffs of the triphenyhnethane series, characterized by containing in their molecule the. group:

which dyestuffs are after being dried and pulverized from red to red-brown powders, being soluble in concentrated sulfuric acid with a red coloration; dyeing wool from acid baths generally yellow to yellow-red shades which on being treated with bichromate change into green to black-fast to potting and light, substantially as described.

2. The herein described dyestulf having probably the following formula:

' coon o- -CH3 oi I -cn 7 CHAS. J. \VRIGHT, \VALTER VONNEGUT. 

